Installing Memory Modules (Dimm) - ASROCK AM1H-M User Manual

2.3 Installing Memory Modules (DIMM)

This motherboard provides two 240-pin DDR3 (Double Data Rate 3) DIMM slots.
It is not allowed to install a DDR or DDR2 memory module into a DDR3 slot; other-
wise, this motherboard and DIMM may be damaged.
The DIMM only fits in one correct orientation. It will cause permanent damage to
the motherboard and the DIMM if you force the DIMM into the slot at incorrect
orientation.
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